Our food choices and purchases are highly influenced by marketing. This new Policy Insight by Tanya Haffner and Amy Culliford examines how the food marketing environment (traditional advertising, online marketing, marketing strategies) contributes to diet-related ill health. The authors analyse how the considerable power of food companies could be leveraged to drive change towards healthier and more sustainable diets. They recommend alternative policies that would ban or restrict advertising of unhealthy foods and instead would increase marketing and promotion of healthy foods that can help enable a shift towards more healthy and sustainable diets.